Concerned with the landscape at the regional scale. It includes variables
that relate to the landscape in terms of its natural and human influenced
attributes, including distance functions of demographic variables, e.g., distance
to roads or rivers, soil quality. It does not include variables specifically
relevant to forest type and quality nor to economic or socio-political
factors.

Economic (E)

All variables related to markets and economic structures and conditions,
e.g., price of beef and GDP.